SparkIV error on startup

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Hi, i bought gta iv to mod a few days ago. I updated and downloaded spark iv to add cars into the game. But when i try to start up SparkIV i get the error message -Your gta iv seems to be modded or is a newer version than this tool supports. if it is a newer version, please check for an update of SparkIV. SparkIV can not run without a supported GTAIV.exe file.- Please help me out if you can.